Are you saying you used Migration Assistant? It sounds like you setup a new account in Mountain Lion then after that used Migration Assistant to import the same account and now have two accounts with the same name, hence the required name change. Does this sound like what you did?I just migrated to my new comp from 10.6 and now I have 2 different administrators and it made me change the name of my new profile. Is this a problem?
If you are not having any trouble with it, you may be okay doing that. It just sounded like you setup a new account called say "bsmith" then used Migration Assistant to import the old "sbmith" onto the new machine and then changed one of the names. Is that what happened?why can't I just delete the original profile I created when I booted up the machine? The one I want to keep is the one from my old comp that I Time Machined on the new comp